Acom 2000A User manual

ACOM 2000A

Automatic

HF Linear Amplifier

User's Manual

Installation, Operation

and Maintenance

July 2020

OUTSTANDING HF POWER PRODUCTS

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

Page 2 of 64 | S e c t i o n ABOUT DOCUMENTATION

June 2020

This manual is for electronic distribution mainly.

If you have it on paper and you no longer need it, please, recycle it!

The latest versions of our User's Manuals are available at

www.acom-bg.com

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

July 2020

S e c t i o n ABOUT DOCUMENTATION | Page 3 of 64

ABOUT DOCUMENTATION

All ACOM documentation (including manuals, brochures, specifications, descriptions, presentations, video

materials, etc.) are based on the latest available information at the time of creation of our documents.

As we always strive to constantly improve and update our products, ALL PRODUCTS, PRODUCT

SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE. ACOM reserves the right to make changes and

improvements at any time without further notice or obligation to notify any person or organization of such

revisions or changes, made in order to improve the reliability, function, quality and design, and/or

performance of the ACOM products and services.

Further, this User's Manual is provided AS IS and ACOM shall not be liable for possible errors contained

herein.

This manual supersedes all previous editions, which thereby become invalid.

The cover images used in the manual are illustrative only.

We are continuously striving to improve our documentation, but nobody is perfect.

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Have you found any errors or would you like to suggest changes in our documentation?

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User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

Page 4 of 64 | S e c t i o n ABOUT DOCUMENTATION

June 2020

Title of Documentation

ACOM 2000A Automatic HF Linear Amplifier

User's Manual

Installation, Operation and Maintenance

Type of Documentation

User's Manual

Purpose of Documentation

This manual explains Installation, Operation and Maintenance of the

ACOM 2000A Automatic HF Linear Amplifier.

Record of Revisions

Description

Release Date

Notes

ACOM 2000A User's Manual

18.11.2004

First edition

ACOM 2000A User's Manual

15.09.2010

Second edition

ACOM 2000A User's Manual

19.05.2017

Third edition

ACOM 2000A User's Manual

14.07.2020

Fourth edition

Validity

The specified data is for product description purposes only and may not be

deemed to be guaranteed unless expressly confirmed in the contract. All

rights are reserved with respect to the content of this manual and the

availability of the product.

Copyrights

Copying this document, giving it to others and the use or communication

of the contents thereof without express authority, are forbidden.

Offenders will be held liable for infringement of any intellectual property

of ACOM Ltd. and all damages which may rise as a result.

Published by

ACOM Ltd.

Bulgaria | Bozhurishte 2227

Sofia-Bozhurishte Economic Zone | 6 Valeri Petrov Str.

GPS coordinates: 42.748616о | 23.209801о

Web: www.acom-bg.com

E-mail: documentation@acom-bg.com

Note

This manual has been printed on chlorine-free bleached paper.

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier  
 
July 2020 
S e c t i o n   ABOUT DOCUMENTATION  |  Page  5 of 64 
 
Contents 
 
ABOUT DOCUMENTATION ................................................................................................................................ 3 
GENERAL INFORMATION ........................................................................................................................... 8 
1. Introduction and Description .......................................................................................................... 8 
2. Owner Assistance ............................................................................................................................ 8 
3. Equipment Supplied and Options .................................................................................................... 9 
4. Features ........................................................................................................................................... 9 
5. Safety Considerations, Explicit Definitions .................................................................................... 11 
INSTALLATION .......................................................................................................................................... 13 
1. Unpacking and Initial Inspection ................................................................................................... 13 
2. Line Voltage Selection ................................................................................................................... 14 
3. Transformer Installation ................................................................................................................ 14 
4. Connections ................................................................................................................................... 16 
5. Installation of Optional Fan ........................................................................................................... 21 
POWER ON, RCU CONTROLS, INDICATORS AND MENUS ......................................................................... 22 
AUTO MODE ............................................................................................................................................ 25 
1. MAIN MENU .................................................................................................................................. 25 
2. AUTO TUNE procedure .................................................................................................................. 29 
3. Erasing USER segments (return to DEFAULT- tunings) .................................................................. 33 
MANUAL MODES ..................................................................................................................................... 35 
1. MANUAL TUNE .............................................................................................................................. 35 
2. MEASURE function ........................................................................................................................ 36 
3. SERVICE procedure ........................................................................................................................ 38 
4. CAT SETTINGS ................................................................................................................................ 38 
5. MORE SETTINGS ............................................................................................................................ 39 
6. HELP ............................................................................................................................................... 41 
OFF MENU ............................................................................................................................................... 42 
1. CALL SIGN ...................................................................................................................................... 42 
2. AUTO ANTENNA CHANGE .............................................................................................................. 42 
3. AUTO OPERATE .............................................................................................................................. 42 
4. SELF ADDRESS ................................................................................................................................ 43 

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June 2020 
 
6.5. CLEAR THE USER TUNINGS ............................................................................................................ 43 
6.6. CLEAR THE MEMORY ..................................................................................................................... 43 
7. CAT OPERATION AND CONNECTIONS ....................................................................................................... 45 
8. MAINTENANCE ........................................................................................................................................ 49 
8.1. Cleaning ......................................................................................................................................... 49 
8.2. Backup Battery Replacement ........................................................................................................ 49 
8.3. Fuse Replacement ......................................................................................................................... 49 
8.4. Tube Replacement ......................................................................................................................... 50 
8.5. The ACOM 2000A Simplified Schematic Diagram ......................................................................... 50 
8.6. Troubleshooting ............................................................................................................................ 53 
9. SPECIFICATIONS ....................................................................................................................................... 56 
9.1. Parameters .................................................................................................................................... 56 
9.2. Functions ....................................................................................................................................... 57 
9.3. Storage and Shipment ................................................................................................................... 58 
10. BRIEF MENU GUIDE ................................................................................................................................. 59 
NOTES .............................................................................................................................................................. 60 
 
Figures 
 
Figure 2-1  Transformer Installation ................................................................................................................ 15 
Figure 2-2  Amplifier Main Unit Connections .................................................................................................. 16 
Figure 2-3  Amplifier Remote Control Unit Connections ................................................................................. 17 
Figure 2-4  Main Unit, RCU, Antenna Selector and Transceiver connections ................................................. 17 
Figure 3-1  Remote Control Unit (RCU) ........................................................................................................... 22 
Figure 3-2  Menu Structure (see also Section 10) ........................................................................................... 23 
Figure 3-3  RCU display - OFF MENU ............................................................................................................... 24 
Figure 4-1  RCU display during warm-up ......................................................................................................... 25 
Figure 4-2  RCU display - MAIN MENU ............................................................................................................ 26 
Figure 4-3  RCU display Main Menu during transmission ............................................................................... 28 
Figure 4-4  RCU display - AUTO TUNE .............................................................................................................. 31 
Figure 4-5  RCU display - end of AUTO TUNE .................................................................................................. 32 
Figure 4-6  RCU display – AUTO TUNE fail ....................................................................................................... 33 

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July 2020

S e c t i o n ABOUT DOCUMENTATION | Page 7 of 64

Figure 5-1 RCU display - MANUAL MODE ....................................................................................................... 35

Figure 5-2 RCU display - MANUAL TUNE ........................................................................................................ 36

Figure 5-3 RCU display - MEASURE ................................................................................................................. 37

Figure 5-4 RCU display - SERVICE .................................................................................................................... 38

Figure 5-5 RCU display – CAT SETTINGS ......................................................................................................... 39

Figure 5-6 RCU display – MORE SETTINGS ..................................................................................................... 39

Figure 5-7 RCU display – MORE SETTINGS – ANTENNAS ................................................................................ 41

Figure 7-1 CAT Connector pin-out front view ................................................................................................. 45

Figure 7-2 CAT Connection by RS-232 Y cable ................................................................................................ 46

Figure 7-3 CAT Connection to ICOM CI-V interface ........................................................................................ 46

Figure 7-4 CAT Connection to KENWOOD RS-232 interface .......................................................................... 47

Figure 7-5 CAT Connection to KENWOOD TTL interface ................................................................................ 47

Figure 7-6 CAT Connection to Elecraft K3....................................................................................................... 47

Figure 7-7 CAT Connection to Yaesu transceiver with RS-232 interface ........................................................ 48

Figure 7-8 CAT Connection to YAESU FT-1000D .............................................................................................. 48

Figure 7-9 CAT Connection to YAESU FT-897 ................................................................................................. 48

Figure 8-1 ACOM 2000A Simplified Schematic Diagram ................................................................................ 52

Tables

Table 2-1 ACOM 2000A Individual Data ......................................................................................................... 13

Table 8-1 Troubleshooting, Error messages ................................................................................................... 55

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

Page 8 of 64 | S e c t i o n GENERAL INFORMATION

June 2020

1. GENERAL INFORMATION

Congratulations on purchasing one of the finest HF amplifiers in the world today.

ACOM is pleased that you have chosen one of our products, and we will endeavor to provide you with the

information and support you need to enjoy your purchase for many years.

We urge you to read all of the following materials before you embark on operating your new amplifier.

1.1. Introduction and Description

This manual explains:

• Installation

• Operation and

• Maintenance

of the ACOM 2000A automatic HF linear amplifier.

The ACOM 2000A is a complete and self-contained linear amplifier that covers all amateur bands from 1.8

through 30MHz, has automatic self-tune capability, and provides up to 1500W output power with less than

60W exciter drive. The amplifier can tolerate loads up to 3:1 VSWR (2:1 on 160 meters) and the process of

matching the antenna impedance to the optimum load of the tubes is automated. It features a Remote

Control Unit (RCU), contains nonvolatile memory for settings on up to ten different antennas per frequency

segment, and offers command capability for use with an external automatic antenna selector and/or

automatic antenna tuner. Transmit/receive switching is capable of full break-in operation (QSK) via an

internal vacuum relay.

All indicators and controls (except the primary mains switch and indicator) are available via the Remote

Control Unit - RCU. All command input to the RCU is menu-driven.

1.2. Owner Assistance

If assistance is needed, you should contact your local dealer first. If necessary, your dealer will contact ACOM

for additional guidance.

If you still have an issue you need to discuss with one of ACOM's specialists, the contact information is as

follows:

ACOM Ltd.

E-mail: support@acom-bg.com

Bulgaria | Bozhurishte 2227

Sofia-Bozhurishte Economic Zone | 6 Valeri Petrov Str.

GPS coordinates: 42.748616о | 23.209801о

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

July 2020

S e c t i o n GENERAL INFORMATION | Page 9 of 64

1.3. Equipment Supplied and Options

The ACOM 2000A amplifier is shipped in two cardboard cartons. One carton contains the power transformer

and the second carton contains the amplifier. The remote control unit (RCU) is shipped inside the amplifier in

the area where the power transformer will be mounted.

There are several individual purchase options available. They are:

• An auxiliary EXTERNAL FAN for continuous modes of operation (rear panel mount);

• CAT CABLES for connection to the supported transceivers.

N O T E

The Technical Supplement to this User's Manual is available from ACOM or from your

dealer on request.

The Technical Supplement containing electrical diagrams, technical details on operation

and maintenance, as well as a list of command set and local network rules for RS232

operation.

The Automatic antenna selector ACOM 2000S and Remote antenna switch ACOM 2000SW are especially

designed to complete your ACOM system.

1.4. Features

• Automated matching of the antenna impedance to the optimum load of the tubes during initial

preparation of user tunings.

• Easy to operate. No operator intervention is required when changing antennas or frequency. Thus, the

risk of inadvertent errors, such as incorrect antenna selection or failure to change band switch, is

eliminated.

• TFT color display. All amplifier status indicators and comments are presented on the Remote Control

Unit (RCU) display. The HELP sub-menu gives on-board technical assistance and troubleshooting

suggestions, power-on elapsed time hours etc. Two color strips display peak forward and reflected

power. Indicators are provided for OPERATE/STANDBY and for fault conditions.

• Easy maintenance. Information on the amplifier's internal status is stored in an "INFO BOX" for the 12

most recent protection faults. This information can be read directly from RCU display by the operator.

• Less QRM, improved Electro Magnetic Compatibility during tuning. Retuning can be achieved in three

ways: manually via the RCU, by the transceiver's CAT system, or with a very short transmission - a single

word on SSB or a dot (even at 40 wpm) on the new frequency is enough to change bands or segments

automatically in a second. Also, the initial process of user tuning settings preparation is done in less

than three seconds at a quarter of nominal output power.

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June 2020

• Saves space on the operating table. Since the amplifier is controlled by the RCU, the main unit can be

located up to 20 meters (65 feet) from the operating position. The supplied 3 meters (10 ft) cable may

be easily extended to the needed length.

• Operates automatically without special signals from the transceiver - "ground on TX" (PTT) and 60W RF

drive power are sufficient to control and operate the amplifier.

• CAT connection to most transceiver models.

• Broadband input matching circuit resulting in very good load to the transceiver over the entire short-

wave spectrum.

• Uses two 4CX800A (GU74B / ГУ74Б) Svetlana (Светлана) high performance ceramic-metal tetrodes

with plate dissipation of 800W each (forced air cooling, grid-driven).

• ACOM maintains strict adherence to the tube manufacturer's specifications for cooling and for the

sequence of applying and removing the different tube voltages. Starting filament current is limited, and

there is constant monitoring and protection of all supply voltages and currents. The Bias Optimizer

decreases the heat dissipated from the tubes, and there is automatic protection against overheating or

insufficient air flow.

• A novel and innovative output RF Arc protection is employed. It safeguards the amplifier, antenna,

antenna selector and tuner against severe damage in case of possible break down.

• High voltage power supply inrush current protection which eliminates the danger of affecting sensitive

devices, connected to the same mains circuit. The amplifier can be configured for 5 nominal line

voltages: 100, 120, 200, 220 and 240VAC (50 or 60Hz). Other nominal values possible on request.

• Continuous measuring and/or monitoring of 20 most important parameters of the amplifier, exciter

and antennas via RCU and computer as described in the Technical Supplement.

• All functions are accessible from a computer via RS232 serial port connection. Also, local networking

capability exists for more than one set of amplifier / antenna units working in a system.

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

July 2020

S e c t i o n GENERAL INFORMATION | Page 11 of 64

1.5. Safety Considerations, Explicit Definitions

The ACOM 2000A Automatic HF Linear Amplifier is a Safety Class I unit, i.e. the third grounding lead of its

mains cord (which is colored yellow with two green stripes) and the ground stud on the rear panel of the

amplifier, marked GND, both must be connected to the station's grounding system for safe operation. The

amplifier is designed to meet international safety standards and complies with CE safety and

electromagnetic compatibility requirements, as well as FCC regulations.

This User's Manual contains information, precautions and indications for cautions and warnings which must

be followed by the user to ensure safe operation and to keep the ACOM 2000A in safe operating condition.

The EXPLICIT DEFINITIONS described below apply to this operating manual:

D A N G E R

These notes call attention to a procedure which, if not correctly performed, could result

in serious personal injuries and even death, fire hazard, electric shock and/or in

substantial material damage.

W A R N I N G

These notes call attention to a procedure which, if not correctly performed, could result

in injuries and equipment damage, not only in the ACOM products, but also to other

systems.

NOTE

These notes call attention to technical tips, as well as to important information for better

understanding of ACOM products.

ORA N G E T E X T a s L I N K S

marks all internal links in the document between Sections, Figure, Tables, etc. for your

convenience.

Внимание!

Danger!

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Внимание!

Danger!

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Page 12 of 64 | S e c t i o n GENERAL INFORMATION

June 2020

PRECAUTIONS:

D A N G E R ! H I G H V O L T A G E !

The amplifier works with high voltages up to 3000V, which are LETHAL!

For your safety, pull the amplifier power plug out of the mains wall outlet and WAIT AT

LEAST 30 minutes EACH TIME BEFORE you remove the cover of the amplifier. Do not

touch any part inside while the amplifier is open because some residual voltages may

still be present.

D A N G E R ! H I G H V O L T A G E !

Never allow anyone, ESPECIALLY CHILDREN, to push anything into holes in the case - this

will cause electric shock. NEVER TOUCH AN ANTENNA during transmission - this may

result in an electric shock or burn. NEVER EXPOSE the amplifier to rain, snow or any

liquids. AVOID placing the amplifier in excessively dusty environments or in direct

sunlight. DO NOT OBSTRUCT AIR INTAKE (rear panel) and EXHAUST (top cover) areas of

the amplifier. Keep a minimum distance of 10cm (4 inches) to the intake and 50cm (20

inches) to the exhaust.

D A N G E R

Do not undertake on your own repairs or changes in hardware or software of the

amplifier in order not to endanger your or other's health and life and not to damage the

amplifier and the equipment connected with it, not covered by warranty. The

manufacturer is not liable for another's actions and responsibility shall be assumed by

the doer.

W A R N I N G

To avoid damage (not covered under warranty) read the Section 2 INSTALLATION of this

User's manual carefully. If you have any doubts about the installation, operation or

safety of the amplifier, please consult your dealer.

Внимание!

Danger!

Внимание!

Danger!

Внимание!

Danger!

Внимание!

Danger!

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

July 2020

S e c t i o n INSTALLATION | Page 13 of 64

2. INSTALLATION

2.1. Unpacking and Initial Inspection

NOTE

Before you install your amplifier, thoroughly read this manual. First, carefully inspect the

both cardboard cartons and its contents for physical damage. ACOM ships amplifiers in

highly protected containers, but it cannot assure that mistreatment by shippers will not

occur. If damage is evident, notify your dealer immediately. Delay may void the carrier's

warranty. Keep all packing for possible future transportation!

In order to take the RCU out of the amplifier, remove the cover by removing all screws except the eight

located in the tube exhaust areas. Remove the plastic tubes holders but keep them for possible future

transportation. Do not remove the silicone rubber chimneys!

W A R N I NG

Check the HV Crowbar (see Figure 2-1 Transformer Installation) - it must reliably short the

HV lead to the chassis when the cover is removed.

Take the RCU out and free the compartment for installing the transformer. Carefully inspect the

RCU and the amplifier main components for any possible shipping damage.

NOTE

Check carefully the serial numbers of amplifier and tubes with the Table of Individual

Data (see Table 2-1 ACOM 2000A Individual Data). If you find any discrepancies, notify

your dealer immediately to have your warranty information corrected.

AMP SN:

Front tube SN:

Rear tube SN:

Voltage Selector Position

VAC

Optional Fan Output Voltage

VDC

Table 2-1 ACOM 2000A Individual Data

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Внимание!

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Page 14 of 64 | S e c t i o n INSTALLATION

June 2020

2.2. Line Voltage Selection

W A R N I N G

To avoid damage (not covered under warranty), verify that the voltage for which the

amplifier is set corresponds to your mains nominal voltage. Most 120V and especially

100V domestic mains installations may not withstand the current consumption and you

will have to reduce the output power to about 1000W PEP. In USA, 240V is strongly

recommended.

Normally the amplifier is supplied with Voltage Selector set for a nominal mains voltage of 240V. There

might be exceptions in cases of special delivery and then the voltage set is noted in the Table of Individual

Data (see Table 2-1 ACOM 2000A Individual Data). If your mains has a different nominal voltage, it will be

necessary for you to contact your dealer or see the Technical Supplement for details.

2.3. Transformer Installation

NOTE

After installing the transformer, the weight of the unit is about 35kg (78 lbs.), which

should preferably be handled by two persons. An assistant may be needed to hold the

amplifier steady during transformer installation.

Position the amplifier, with the transformer not yet installed, flat on a table near the place where it will be

used. During the process described below, when the amplifier cover is removed, take care not to torque or

twist the chassis nor let the amplifier stand on edge. Do not lift the unit by only one corner.

Orient the amplifier on the table so that the transformer compartment is in front of you (see Figure 2-1

Transformer Installation).

Внимание!

Danger!

Забележка!

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User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

July 2020

S e c t i o n INSTALLATION | Page 15 of 64

AC

P

ower

HV PCB HV

Crowbar

Console

Mains

Connector

HV Connector Motor Voltage Connector SG Voltage

Connector

Figure 2-1 Transformer Installation

Take the transformer out of the carton and remove the shipping board but do not discard the shipping

board or the bolts. For transformer mounting, four shorter bolts (M8x16mm) are provided in a

polyethylene envelope inside the same carton. Use the polyethylene envelope to store the longer shipping

bolts. Keep the board together with the four long bolts and all packing for possible future transportation of

the transformer.

Move the transformer, using its rope sling handle, into the compartment. Take care not to damage the

wiring or components and position the transformer so that the captive nuts are aligned with the

corresponding chassis holes. Make sure that the transformer is centered. The transformer bolts must be

installed NOW for safe operation.

Holding its two sides (front and back) simultaneously, pull the amplifier towards you just far enough that

the two outside transformer captive nuts appear off the table edge. Support the amplifier until your

assistant loosely screws in the two outside transformer-mounting bolts. Pull the amplifier a further 12-

13cm (about 5 inches) until the other two captive nuts appear off the table edge. Keep supporting the

amplifier until your assistant loosely screws them in. After checking that the transformer is centered,

tighten all 4 bolts. Now move the amplifier back over the table.

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Page 16 of 64 | S e c t i o n INSTALLATION

June 2020

The transformer's Mains Connector plugs into the AC power console (see Figure 2-1 Transformer Installation).

The other three connectors (HV, Motors Voltage & Screen Grid Voltage) plug into the HIGH VOLTAGE PCB,

clearly seen on top.

Replace the cover and carefully reinstall all screws.

2.4. Connections

The amplifier is now ready to be connected to your station. Connection must be accomplished in the order

described below, before you apply mains voltage to the amplifier.

W A R N I N G

Have in mind that the grounding system may have to withstand currents over 20A with

insignificant voltage drop on it. Therefore, it may be necessary to improve it

considerably (to become lower-resistive, i.e. with heavier leads and lower-resistive

ground path). The grounding leads should be at least 8mm2 (AWG 8 or SWG 10).

Figure 2-2 Amplifier Main Unit Connections

Внимание!

Danger!

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July 2020

S e c t i o n INSTALLATION | Page 17 of 64

Figure 2-3 Amplifier Remote Control Unit Connections

Figure 2-4 Main Unit, RCU, Antenna Selector and Transceiver connections

User's Manual | ACOM 2000A | Automatic HF Linear Amplifier

Page 18 of 64 | S e c t i o n INSTALLATION

June 2020

a) Connect the ground stud of the amplifier Main Unit (on the rear panel, marked GND) to the

station's grounding system (see Figure 2-2 Amplifier Main Unit Connections, Figure 2-3 Amplifier

Remote Control Unit Connections and Figure 2-4 Main Unit, RCU, Antenna Selector and Transceiver

connections).

b) Connect a coaxial cable with a PL-259 plug from the transceiver output to the amplifier rear

panel RF INPUT socket.

W A R N I N G

If this is the first time you will use a high-power amplifier in your station, pay attention

to the coaxial cable type from the amplifier's output. It must handle the increased power

safely - particularly on the higher frequency bands. We recommend you use RG213 or

better coaxial cable. Similar good quality coaxial cable should be used throughout your

antenna system. Check the power capability of the antenna selector, the tuner and the

antenna itself (especially multiband trap antennas).

W A R N I N G

Do not use your transceiver's internal tuner with the 2000A – this can damage the input

of the ACOM 2000A.

c) Connect a coaxial cable from the amplifier output (on the rear panel, marked RF OUTPUT)

with a PL-259 plug to the antenna selector or tuner or to the antenna for the respective

band.

NOTE

Your amplifier will not work if KEY-IN is not connected properly.

Transceiver producers give different names to this output and they are for instance TX-GND, SEND, T/R-

LINE, etc. Some transceivers require that ground on transmit is implemented via a software command, or

by changing the setting of a switch on the rear panel, or interior of the transceiver. Check your transceiver's

manual.

d) Run a cable terminated in a RCA phono plug from the transceiver socket providing ground on

transmit to the RCU rear panel KEY-IN socket.

Внимание!

Danger!

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Danger!

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July 2020

S e c t i o n INSTALLATION | Page 19 of 64

NOTE

If there is a CAT connection between your amplifier and your transceiver, which carries

also the KEY-IN signal, you don't need a separate KEY-IN cable. Not all transceivers

however have this capability. Please, see Section 7 CAT OPERATION AND CONNECTIONS for

more details.

e) The KEY-OUT socket on the RCU rear panel provides an extra control signal from the amplifier

to the transceiver. It could be used to improve the transmit/receive switching.

If your transceiver has a suitable input that disables transmission, we recommend that you connect it with a

cable terminated in a Phono connector to the KEY-OUT socket of the RCU. Transceiver producers give

different names to this input and they are for instance TX-INHIBIT, MUTE, LINEAR, etc. Check your

transceiver’s manual. Consult your dealer or see the Technical Supplement for details.

If your transceiver has not such an input don't worry - the amplifier will function normally as well and then

the KEY-OUT may remain unused.

NOTE

If there is a CAT connection between your amplifier and your transceiver, which carries

also the KEY-OUT signal, you don't need a separate KEY-OUT cable. Please, see Section 7

CAT OPERATION AND CONNECTIONS.

f) Connect the supplied DB9 / DB9+2RCA control cable between the RCU connector marked

AMPL and the amplifier REMOTE CONTROL connector. Plug in the two Phono connectors

marked KEY-IN and KEY-OUT to the respective amplifier sockets. Screw in the knurled screws.

g) To control the amplifier via CAT you will need a special cable from the transceiver to the

High-Density HD-15 connector on the RCU rear panel, marked CAT. The HD-15 pinout and

cable diagrams for various transceivers are shown in Section 7 CAT OPERATION AND

CONNECTIONS. The cable can be supplied as an option with the amplifier or purchased

separately or you can assemble your own. Check with your dealer for cable options for your

transceiver.

h) Automatic antenna selector ACOM 2000S can be connected to the respective connector on

the RCU rear panel.

i) The ALC output of the amplifier normally remains unused. In case of need of ALC for your

transceiver, which we do not recommend, you may contact your dealer or see the Technical

Supplement.

j) The connector on the amplifier rear panel, marked RS232 INTERFACE, remains unused until

you decide to use the amplifier with a computer or in a local network as described in the

Technical Supplement.

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W A R N I N G

Do not connect to the connector, marked RS-232 a standard cable because this may

result in damage in both - amplifier or connected equipment. In order to use the RS-232

interface, a special cable must be prepared. Contact your dealer or see Technical

Supplement for details.

k) Mains plug and fuses.

W A R N I N G

If your amplifier is only fitted with one mains fuse, it is suitable for 0-220/240 VAC

electricity supplies ONLY (these supplies are standard in the European Community). Your

dealer will check that your amplifier is correctly fused before it is shipped to you.

Customers should check with a qualified electrician if the amplifier is to be used outside

the country in which it was purchased.

Due to the different standards in different countries, the mains plug is supplied and mounted by the dealer.

He connects to the mains cord end a standard mains plug which meets the Safety Class I units standard in

your country. The ground lead of the amplifier's mains cord is colored yellow with two green stripes and the

blue and brown leads are active. When the amplifier is to be used with only one mains fuse, it is connected

in series with the brown lead which must be the active. If you have any doubts about the correct way of

connecting the wires, consult your dealer. All amplifiers sold in the USA will have two fused leads.

l) Preparation of wall outlet for the amplifier.

W A R N I N G

Before connecting the amplifier to your mains supply, be sure that the supply is

correctly wired, and is adequate for the current drawn by the amplifier. Make certain

that the grounding lead is connected properly in the wall outlet for the amplifier.

It is preferable that you use the wall outlet closest to the source. The installation leads should be at least

2.5mm2 (AWG 12 or SWG 15). Check if the respective fuses can handle current up to 20A, as well as if the

voltage corresponds to the voltage for which the amplifier is set (see Section 2.2 Line Voltage Selection). If

you connect the amplifier to a different mains outlet, be sure that you check it, too.

Make sure the main Power Switch on the front panel is in OFF position (so that the red strip on the switch is

hidden) and insert amplifier's mains plug into the wall outlet prepared for it. The amplifier remains

switched off.

Внимание!

Danger!

Внимание!

Danger!

Внимание!

Danger!

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Acom 2000A User manual

Acom 2000A User manual

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